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CDM-625 Advanced Satellite Modem
Forward Error Correction Options
1
1E-1
Uncoded
BPSK/QPSK
1E-2
1E-3
1E-4
1E-5
1E-6
1E-7
1E-8
Typical performance
1E-9
1
BER
Figure 7-6. Rate 21/44 BPSK, QPSK, OQPSK Turbo Product Coding
2
3
4
5
Rate 21/44 BPSK/QPSK/OQPSK
Spec limit
Rate 21/44
B/Q/OQPSK
2
3
4
5
6
7
8
Comtech Turbo Product Codec
6
7
8
7–16
MN-0000036 (Ref MN/CDM625.IOM)
Eb/No in dB
9
10
11
Notes:
* Rate 21/44 QPSK is
shown as R1/2 on the
front panel
* The OQPSK acquisition
and tracking thresholds
are approx. 1 dB worse
than the QPSK case
9
10
11
Revision 1
12
12
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